While the sump with ladder formwork was a pain in the neck to construct due to the fiddly ladder treads, it is always good to see that the job turned out pretty good.

Concrete Sump with Ladder

Concrete patchers will now come along and plug the z-bar holes.

Timber used to brace internal sump formwork at Prominent Hill weigh bridge.

Sump Formwork with Ladder

You’ll notice that one of the center timbers is not used to brace the formwork, rather, it is used to support the yellow ladder treads. Extra z-bars and timbers that support the external forms are also just visible in the above photo.

Sump Formwork Ladder Support

The vertical timber holds the ladder treads firmly against the plywood while the treads are wired to a nail (not visible) keeping the treads horizontal.

Sump Formwork Ladder (internal view)

You’ll also notice that there is two pieces of ply used in the center of the ladder tread instead of one which makes easy work when it comes to stripping. On the other hand, if one piece of ply is used for these types of formwork, it is a time-consuming nightmare to strip.

See this concrete sump poured and stripped.